SpringBoot RC2: Missing Netty dependency and hint

With a trivial Webflux application, when built and run in macOS, the error below is shown in runtime.

It can be solved by adding the dependency: implementation group: 'io.netty', name: 'netty-resolver-dns-native-macos', classifier: 'osx-aarch_64' for apple silicon (or specifying classifier: osx-x86_64 otherwise), and adding the following hint:

hints
    .reflection()
    .registerConstructor(io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider.class.getConstructors()[0], ExecutableMode.INVOKE);

The stacktrace is the following.

Unable to load io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider, fallback to system defaults. This may result in incorrect DNS resolutions on MacOS. Check whether you have a dependency on 'io.netty:netty-resolver-dns-native-macos'

java.lang.NoSuchMethodException: io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider.<init>()
        at java.base@17.0.5/java.lang.Class.getConstructor0(DynamicHub.java:3585) ~[demo:na]
        at java.base@17.0.5/java.lang.Class.getConstructor(DynamicHub.java:2271) ~[demo:na]
        at io.netty.resolver.dns.DnsServerAddressStreamProviders.<clinit>(DnsServerAddressStreamProviders.java:63) ~[na:na]
        at io.netty.resolver.dns.DnsNameResolverBuilder.<init>(DnsNameResolverBuilder.java:60) ~[na:na]
        at reactor.netty.transport.NameResolverProvider.newNameResolverGroup(NameResolverProvider.java:479) ~[na:na]
        at reactor.netty.transport.ClientTransportConfig.lambda$getOrCreateResolver$0(ClientTransportConfig.java:246) ~[demo:1.1.0]
        at java.base@17.0.5/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708) ~[demo:na]
        at reactor.netty.internal.util.MapUtils.computeIfAbsent(MapUtils.java:46) ~[na:na]
        at reactor.netty.transport.ClientTransportConfig.getOrCreateResolver(ClientTransportConfig.java:245) ~[demo:1.1.0]
        at reactor.netty.transport.ClientTransport.runOn(ClientTransport.java:352) ~[demo:1.1.0]
        at reactor.netty.transport.ClientTransport.runOn(ClientTransport.java:42) ~[demo:1.1.0]
        at reactor.netty.transport.Transport.runOn(Transport.java:249) ~[demo:1.1.0]
        at org.springframework.http.client.reactive.ReactorClientHttpConnector.lambda$applyLoopResources$1(ReactorClientHttpConnector.java:86) ~[demo:6.0.0-RC4]
        at java.base@17.0.5/java.util.function.Function.lambda$andThen$1(Function.java:88) ~[demo:na]
        at org.springframework.http.client.reactive.ReactorClientHttpConnector.<init>(ReactorClientHttpConnector.java:79) ~[demo:6.0.0-RC4]
        at org.springframework.boot.autoconfigure.web.reactive.function.client.ClientHttpConnectorConfiguration$ReactorNetty.reactorClientHttpConnector(ClientHttpConnectorConfiguration.java:69) ~[demo:na]
        at org.springframework.boot.autoconfigure.web.reactive.function.client.ClientHttpConnectorConfiguration__BeanDefinitions$ReactorNetty__BeanDefinitions.lambda$getReactorClientHttpConnectorInstanceSupplier$0(ClientHttpConnectorConfiguration__BeanDefinitions.java:35) ~[na:na]
        at org.springframework.util.function.ThrowingBiFunction.apply(ThrowingBiFunction.java:68) ~[demo:6.0.0-RC4]
        at org.springframework.util.function.ThrowingBiFunction.apply(ThrowingBiFunction.java:54) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.lambda$get$2(BeanInstanceSupplier.java:208) ~[na:na]
        at org.springframework.util.function.ThrowingSupplier.get(ThrowingSupplier.java:59) ~[demo:6.0.0-RC4]
        at org.springframework.util.function.ThrowingSupplier.get(ThrowingSupplier.java:47) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.invokeBeanSupplier(BeanInstanceSupplier.java:220) ~[na:na]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.get(BeanInstanceSupplier.java:208) ~[na:na]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainInstanceFromSupplier(AbstractAutowireCapableBeanFactory.java:1225) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1210) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1157) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:561) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:521) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:326) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:324) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1405) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1325) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.resolveArgument(BeanInstanceSupplier.java:334) ~[na:na]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.resolveArguments(BeanInstanceSupplier.java:271) ~[na:na]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.get(BeanInstanceSupplier.java:206) ~[na:na]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainInstanceFromSupplier(AbstractAutowireCapableBeanFactory.java:1225) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1210) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1157) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:561) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:521) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:326) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:324) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1628) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1585) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveMultipleBeans(DefaultListableBeanFactory.java:1431) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1363) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory$DependencyObjectProvider.resolveStream(DefaultListableBeanFactory.java:2131) ~[na:na]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory$DependencyObjectProvider.orderedStream(DefaultListableBeanFactory.java:2125) ~[na:na]
        at org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientAutoConfiguration.webClientBuilder(WebClientAutoConfiguration.java:54) ~[demo:na]
        at org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientAutoConfiguration__BeanDefinitions.lambda$getWebClientBuilderInstanceSupplier$0(WebClientAutoConfiguration__BeanDefinitions.java:29) ~[na:na]
        at org.springframework.util.function.ThrowingBiFunction.apply(ThrowingBiFunction.java:68) ~[demo:6.0.0-RC4]
        at org.springframework.util.function.ThrowingBiFunction.apply(ThrowingBiFunction.java:54) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.lambda$get$2(BeanInstanceSupplier.java:208) ~[na:na]
        at org.springframework.util.function.ThrowingSupplier.get(ThrowingSupplier.java:59) ~[demo:6.0.0-RC4]
        at org.springframework.util.function.ThrowingSupplier.get(ThrowingSupplier.java:47) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.invokeBeanSupplier(BeanInstanceSupplier.java:220) ~[na:na]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.get(BeanInstanceSupplier.java:208) ~[na:na]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainInstanceFromSupplier(AbstractAutowireCapableBeanFactory.java:1225) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1210) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1157) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:561) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:521) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:344) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1405) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1325) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.resolveArgument(BeanInstanceSupplier.java:334) ~[na:na]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.resolveArguments(BeanInstanceSupplier.java:271) ~[na:na]
        at org.springframework.beans.factory.aot.BeanInstanceSupplier.get(BeanInstanceSupplier.java:206) ~[na:na]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainInstanceFromSupplier(AbstractAutowireCapableBeanFactory.java:1225) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1210) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1157) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:561) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:521) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:326) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:324) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1405) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1325) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.aot.AutowiredFieldValueResolver.resolveValue(AutowiredFieldValueResolver.java:189) ~[na:na]
        at org.springframework.beans.factory.aot.AutowiredFieldValueResolver.resolveAndSet(AutowiredFieldValueResolver.java:167) ~[na:na]
        at space.vyoma.platform.services.templateservice.service.TemplateWebClientService__Autowiring.apply(TemplateWebClientService__Autowiring.java:16) ~[na:na]
        at org.springframework.beans.factory.support.InstanceSupplier$1.get(InstanceSupplier.java:82) ~[na:na]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainInstanceFromSupplier(AbstractAutowireCapableBeanFactory.java:1225) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1210) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1157) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:561) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:521) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:326) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:324) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1405) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1325) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.aot.AutowiredFieldValueResolver.resolveValue(AutowiredFieldValueResolver.java:189) ~[na:na]
        at org.springframework.beans.factory.aot.AutowiredFieldValueResolver.resolveObject(AutowiredFieldValueResolver.java:154) ~[na:na]
        at org.springframework.beans.factory.aot.AutowiredFieldValueResolver.resolve(AutowiredFieldValueResolver.java:143) ~[na:na]
        at space.vyoma.platform.services.templateservice.service.TemplateSchedulerService__Autowiring.apply(TemplateSchedulerService__Autowiring.java:15) ~[na:na]
        at org.springframework.beans.factory.support.InstanceSupplier$1.get(InstanceSupplier.java:82) ~[na:na]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainInstanceFromSupplier(AbstractAutowireCapableBeanFactory.java:1225) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1210) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1157) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:561) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:521) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:326) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:324) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[demo:6.0.0-RC4]
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:961) ~[demo:6.0.0-RC4]
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:916) ~[demo:6.0.0-RC4]
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:584) ~[demo:6.0.0-RC4]
        at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.refresh(ReactiveWebServerApplicationContext.java:66) ~[demo:3.0.0-RC2]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:730) ~[demo:3.0.0-RC2]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:432) ~[demo:3.0.0-RC2]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) ~[demo:3.0.0-RC2]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1302) ~[demo:3.0.0-RC2]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1291) ~[demo:3.0.0-RC2]
        at com.example.demo.DemoApplication.main(DemoApplication.java:10) ~[demo:na]

Comment From: wilkinsona

Duplicates https://github.com/oracle/graalvm-reachability-metadata/issues/100.

Comment From: dr-eme

@wilkinsona: While adding the hints to the reachability metadata is very welcome, I was wondering if the additional dependency for netty-resolver-dns-native-macos could be included in Weblfux's starter, or included somehow in the dependency-management, if it detects the target OS is macOS.

Currently, I have the following on my build.gradle, to allow local development, but such dependency is not required upstream, so it would be way more cleaner if Spring handles this automatically.

  if (org.gradle.nativeplatform.platform.internal.DefaultNativePlatform.getCurrentOperatingSystem().isMacOsX()) {
    if (org.gradle.nativeplatform.platform.internal.DefaultNativePlatform.getCurrentArchitecture().isArm()) {
      implementation group: 'io.netty', name: 'netty-resolver-dns-native-macos', classifier: 'osx-aarch_64'
    } else {
      implementation group: 'io.netty', name: 'netty-resolver-dns-native-macos', classifier: 'osx-x86_64'
    }
  }

Comment From: bclozel

@dr-eme This has been discussed in #29999